My "crusade" - as you put it - is about good sounding recordings, not DIY'ers per se. However the vast majority of DIYers don't come anywhere CLOSE to the sonic potential they have at their disposal.
As to your "feeling threatened" comment... actually the opposite is quite true... the "home recording" ethic has resulted in MORE business for me, as I mix for many of the more serious Indie bands who've realized they can't get a mix sounding right on their own....
As I said, my comments are based more on advocating recorded sound quality than any sort of anti-DIY sentiment. If more DIY'ers actually lived up to their potential, you likely wouldn't hear a peep from me. As it is, however, many have a very long way to go, and even then, I've found that most aren't actually interested in learning proper techniques anyways.
There is an actual CRAFT and SKILL to recorded sound, ya know..... and THAT'S what I "crusade" about.